[webapi] Integrated 42 tests for HTML5 Session History

- approved: 42

Impacted tests(approved): new 42, update 0, delete 0
Unit test platform: [IVI] crosswalk-10.38.222, t-e-c 0.107
Unit test result summary: pass 42, fail 0, block 0
[webapi] Integrate 57 tests for XmlHttpRequest

 - designed: 10, approved: 47

Impacted tests(approved): new 47, update 0, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 47, fail 0, block 0
[webapi] Integrate 43 test for DOM/JS related enhancements in HTML5

- approved: 43

Impacted tests(approved): new 43, update 0, delete 0
Unit test platform: [IVI] crosswalk-10.38.222, t-e-c 0.107
Unit test result summary: pass 43, fail 0, block 0
[webapi][XWALK-2478] Rename Vehicle Info test suite because it will be implemented by Tizen IVI

Unit test platform: Tizen IVI
Unit test result summary: Pass:15, Fail:14, Block:0

This closes #1158 and resolves #1181.
[webapi] Integrate 11 tests for HTML5 AppCache

- approved: 11

Impacted tests(approved): new 11, update 0, delete 0
Unit test platform: [IVI] crosswalk-10.38.222, t-e-c 0.107
Unit test result summary: pass 11, fail 0, block 0
Merge pull request #1180 from xinliux/sessionhistory-integrate

[webapi] Integrated 42 tests for HTML5 Session History
Merge pull request #1183 from yunxiaoxie/move-httprequest

[webapi] Integrate 57 tests for XmlHttpRequest
Merge pull request #1182 from xinliux/jsenhance-integrate

[webapi] Integrate 43 test for DOM/JS related enhancements in HTML5
Merge pull request #1184 from xinliux/appcache-integrate

[webapi] Integrate 11 tests for HTML5 AppCache